What does the haematocrit value represent?
Correct answer: A. The percentage of blood made up of red blood cells
- A. The percentage of blood made up of red blood cells
- B. The percentage of plasma made up of clotting factors
- C. The amount of oxygen dissolved in the plasma
- D. The number of white blood cells in a blood sample
Explanation
Haematocrit is the proportion of whole blood occupied by red blood cells. It is usually reported as a percentage and may fall in anaemia or rise with dehydration.
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Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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